Quote Originally Posted by 4950cycle View Post
Is that you Prodigit from the scooter forum ? Anyway, These OHV only have so much HP. If you gear them to tall they won't pull the gearing unless your 5'5 and 105 lbs.. I'm 6'3 and 255 lbs. I changed my factory gearing to 16/38 . It was just a little to tall. Just wouldn't pull it worth a darn with my big wind catching ass on it. I had to drop one tooth on the front (worth 3-4 teeth on the rear) At 62 indicated (actually 57 or 58) and got 80 MPG . That's about the best I can do with it. Hell, my Ninja 250 can get 70 or better at that moderate speed.
Yup, is me.
On the BMS TBX260 I have a 100:1 ratio RPM over MPH, and the bike goes 82MPH. It's 256cc fuel injected though...
I use this RPM over MPH ratio, because it's indiscriminate against CVT or manual geared bike.

On the 150cc TaoTao I have a 116:1 gear ratio (or 7k RPM @ 60MPH); and it tops out at 63MPH GPS verified.

Those bikes accelerate just fine, save for near the end of the variator, where speed creeps those last 10-15MPH to top speed. You know that on those scooters they have maxed out their gearing on those engines.

I know they are different engine types, but even with different engine types, you should get a certain amount of speed for a certain amount of CC's.
The Bobber is probably the least aerodynamic bike of them all (RTA, RTC, RTC-B, RTD); so wind drag may eat a couple of mph from the top speed.

If the gearing is too heavy, you could always upshift one gear, for better acceleration.
I guess I'm lucky at 100LBS lighter.

BTW, I finished reading the first 114 pages of this thread.
Seems like some people get the RTB-A (which is with black hardware) and some get the regular RTB (with chrome hardware).
Get the RTB-A if you can. Black means less rust!